Local anesthetic

Medicine can stop pain in one spot.

It helps your body feel nothing there. This is great for a visit to the dentist. It makes hard work much easier.

Doctors use it for many things. It helps during eye surgery. It helps with work on your feet. It can even help with heart surgery.

Some medicine is a cream or a gel. You put it on your skin. It stops the surface from feeling pain. This helps when getting a shot.

Doctors might use a needle to give it. The medicine can stop a muscle from moving. This helps the doctor work safely.

It is a very helpful tool. It helps people feel better during care.

A local anesthetic is a special medicine. It stops pain in one part of the body. It does not make you sleep. This is different from general anesthesia. General anesthesia makes you lose consciousness.

Doctors use these medicines in many ways. Some are creams or gels. You put them on your skin. This is called topical anesthesia. It helps during blood tests. Other times, doctors use a needle. This can stop a muscle from moving. This is called a nerve block.

Many surgeries use this medicine. Dentists use it for fillings or pulling teeth. It is also used for eye surgery. Doctors use it for work on feet and legs. It can even help with heart surgery.

There are different types of these drugs. Some work for a short time. Others work for a long time. Many names end in "-caine." This comes from the word cocaine. Cocaine was used as a medicine long ago.

Sometimes, there are side effects. The skin might look white. This happens because blood flow slows down. A person might feel dizzy. Most people feel better very quickly.

A local anesthetic is a special type of medicine. It stops all feeling, including pain, in one specific part of the body. This is different from general anesthesia. General anesthesia makes a person lose consciousness and sleep.

With local anesthesia, the person stays awake. Doctors use these medicines to help during or after surgery. Sometimes, they use them on nerve pathways to stop muscles from moving too. This is called a nerve block. It helps make medical procedures much easier for patients.

There are many ways doctors can give this medicine. They might use topical anesthesia. This means they put a cream, gel, or spray on the surface of the skin. This helps the medicine soak in deeper.

Other times, they use an injection to reach nerves. This can happen through an epidural or a spinal block. Doctors even use it for diagnostic tests. For example, it makes a bone marrow aspiration less painful. It can also be used when putting in devices like pacemakers.

These medicines have a long history. Many names for these drugs end in the letters "-caine." This suffix comes from the word cocaine. In the past, cocaine was used as a local anesthetic.

Today, scientists make synthetic versions. These new versions are much safer. They do not cause the same problems as cocaine did. They also have a much lower potential for abuse. This makes them better for modern medical use.

Doctors choose different drugs based on how long they need the medicine to work. Some drugs have a short duration of action. Examples include benzocaine and procaine. Other drugs have a medium duration. Lidocaine and prilocaine are in this group. Some drugs are very strong and last a long time. Tetracaine and bupivacaine are examples of these high-potency drugs.

Dentists use them for fillings or root canals. Surgeons use them for eye or heart surgery.

Most people handle these medicines very well. However, there can be some side effects. The skin might look white at the site. This happens because the blood flow slows down. This is called vasoconstriction. Sometimes, the area might swell up.

In rare cases, a person might feel dizzy or have a metallic taste in their mouth. If a person is very nervous, they might feel light-headed. This is often just an emotional reaction to the procedure. Most side effects go away quickly as the medicine wears off.

A local anesthetic is a medication used to cause an absence of all sensation in a specific body part. This includes the loss of pain, but unlike general anesthesia, it does not cause a loss of consciousness. While general anesthesia eliminates sensation throughout the entire body, local anesthesia is targeted. When these drugs are applied to specific nerve pathways, a process called a local anesthetic nerve block, they can also induce paralysis. This means the patient loses muscle function in that area as well.

Scientists classify these medications into two main chemical groups. These are known as amino esters and amino amides. Many modern versions are synthetic, meaning they are made in a lab. These synthetic versions are different from cocaine, which was used as an anesthetic in the past. Synthetic drugs have a much lower potential for abuse. They also generally do not cause hypertension or vasoconstriction, which is the narrowing of blood vessels. Interestingly, many of these drug names end with the suffix "-caine." This naming convention is derived from the word cocaine.

Doctors choose specific drugs based on their potency and how long they last. Some medications have a short duration of action and low potency, such as benzocaine, procaine, or chloroprocaine. Others offer a medium duration and medium potency, including articaine, lidocaine, and prilocaine. For procedures requiring more intense relief, high-duration and high-potency drugs are used. These include tetracaine, bupivacaine, cinchocaine, and ropivacaine.

There are several techniques for administering these drugs. Topical anesthesia involves applying a cream, gel, ointment, or spray to a surface. To help the medicine soak in deeper, it may be dissolved in solvents like DMSO. Other methods include infiltration, where the drug is injected into tissue. More complex methods involve blocks, such as a brachial plexus block, an epidural block, or spinal anesthesia. Spinal anesthesia is also known as a subarachnoid block. Other uses include iontophoresis and even using drugs like lidocaine as anti-arrhythmic agents to help with heart rhythms.

Local anesthetics are vital in many medical fields. In dentistry, they are used for fillings, crowns, root canals, and extractions. Podiatrists use them for surgeries on the feet, such as bunionectomies or hammertoe repairs. They are also essential in eye surgery, such as during cataract removal. Surgeons performing heart, lung, or abdominal operations often use epidural or spinal anesthesia. Even during diagnostic tests like a lumbar puncture or bone marrow aspiration, these drugs make the process less painful. They are also used to help place medical devices like pacemakers or chemotherapy ports.

While generally safe, local anesthesia can cause side effects. At the injection site, tissue swelling or edema may occur. The area might also look white, which is called blanching. This happens because vasoconstriction prevents blood flow to the area. This effect usually wears off in less than two hours. There is also a risk of a haematoma, which is a collection of blood caused by accidental damage to a blood vessel. While permanent nerve damage is rare, it can happen. Most people, about 92 to 97 percent, recover from nerve injury within four to six weeks.

Systemic effects can occur if the drug reaches high levels in the bloodstream. This might happen if a dose intended for an epidural is accidentally injected into a vessel. High concentrations can affect the central nervous system, causing symptoms like ringing in the ears, dizziness, or even seizures. In very severe cases, it can lead to coma or respiratory arrest. Additionally, a patient's emotional state can cause a vasovagal collapse. This is a reaction to fear or nervousness that can cause paleness, sweating, or a temporary loss of consciousness. Medical professionals work to keep patients comfortable to avoid these reactions.